The Embedded Experience (EE) integration support which was part of the OpenSocial spec was never completed - and AppFusions dove deeply into the effort on what it would take to do.
AppFusions have detailed eng discovery, code details and more - all vetted. It is collectively not alot of work, if understood. And the advantage to this, for more engaged in context activity streams with integrated system integrations is significant.
This is related to this: https://connections.ideas.aha.io/ideas/IDEACNCTNS-I-171